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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
*
*/
#ifndef _ASM_X86_MMZONE_32_H
#define _ASM_X86_MMZONE_32_H
#include <asm/smp.h>
#ifdef CONFIG_NUMA
extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[nid])
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DISCONTIGMEM
/*
* generic node memory support, the following assumptions apply:
*
* 1) memory comes in 64Mb contiguous chunks which are either present or not
* 2) we will not have more than 64Gb in total
*
* for now assume that 64Gb is max amount of RAM for whole system
* 64Gb / 4096bytes/page = 16777216 pages
*/
#define MAX_NR_PAGES 16777216
#define MAX_SECTIONS 1024
#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
extern s8 physnode_map[];
static inline int pfn_to_nid(unsigned long pfn)
{
#ifdef CONFIG_NUMA
return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
#else
return 0;
#endif
}
static inline int pfn_valid(int pfn)
{
int nid = pfn_to_nid(pfn);
if (nid >= 0)
return (pfn < node_end_pfn(nid));
return 0;
}
#define early_pfn_valid(pfn) pfn_valid((pfn))
#endif /* CONFIG_DISCONTIGMEM */
#endif /* _ASM_X86_MMZONE_32_H */